MD Settings: Allow searching the lock screen subpage.

chrome/browser/resources/settings/people_page/people_page.js

Index: chrome/browser/resources/settings/people_page/people_page.js
diff --git a/chrome/browser/resources/settings/people_page/people_page.js b/chrome/browser/resources/settings/people_page/people_page.js
index f525568b1b57b4ebe00d6f7655b84366d0c4b763..bc4e9a7f0555e1f27bd7dba82029c6fb1039b89c 100644
--- a/chrome/browser/resources/settings/people_page/people_page.js
+++ b/chrome/browser/resources/settings/people_page/people_page.js
@@ -107,7 +107,8 @@ Polymer({
             settings.Route.CHANGE_PICTURE.path,
             '#picture-subpage-trigger .subpage-arrow');
         map.set(
-            settings.Route.LOCK_SCREEN.path, '#lockScreenSubpageTrigger');
+            settings.Route.LOCK_SCREEN.path,
+            '#lock-screen-subpage-trigger .subpage-arrow');
         map.set(
             settings.Route.ACCOUNTS.path,
             '#manage-other-people-subpage-trigger .subpage-arrow');